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S-Ethyl dipropylthiocarbamate (EPTC) is a selective herbicide used for pre-emergent control of certain grasses and broadleaf weeds in Australia and the United States. [3] [4] It was introduced in 1957. [5] EPTC can be applied pre-emergently or post-emergently and its effectiveness does not depend on post-application rainfall.
By far the most frequently used products are formulations for mixing with water then applying as sprays. Water miscible, older formulations include: EC Emulsifiable concentrate; WP Wettable powder; SL Soluble (liquid) concentrate; SP Soluble powder; Newer, non-powdery formulations with reduced or no use of hazardous solvents and improved ...
Nufarm was established in Melbourne, Australia during the mid 1950s by Max Fremder. He began selling phenoxy herbicides to professional spray applicators in regional Victoria. Between the mid 1980s and early 2000s, Nufarm was a subsidiary of New Zealand-based Fernz Corporation.
As a herbicide, it was introduced in 1962, [2] and it quickly became the fourth most used herbicide in the US, with 28.5 million pounds (12.9 thousand tonnes) used in 1974. [4] Its use has declined significantly, to 15 million pounds (6.8 thousand tonnes) in 1991 to 950 thousand pounds (430 tonnes) by 1998.
To prevent growth of crabgrass, preemergent herbicides must be applied at a critical time. If they are applied to the soil too early, they get washed too deep into the soil or washed away by rainwater. If they are applied too late, the key enzyme inhibited is no longer active. The best control requires a second application about 6–8 weeks later.
Mixing time may refer to: Blend time , the time to achieve a predefined level of homogeneity of a flow tracer in a mixing vessel Mixing (mathematics) , an abstract concept originating from physics used to attempt to describe the irreversible thermodynamic process of mixing
Blend time, sometimes termed mixing time, is the time to achieve a predefined level of homogeneity of a tracer in a mixing vessel. Blend time is an important parameter to evaluate the mixing efficiency of mixing devices. [1] In order to make this definition valid, the tracer should be in the same physical phase (e.g. liquid) as the bulk material.
One major complication to the use of herbicides for weed control is the ability of plants to evolve herbicide resistance, rendering the herbicides ineffective against target plants. Out of 31 known herbicide modes of action, weeds have evolved resistance to 21. 268 plant species are known to have evolved herbicide resistance at least once. [59]